| | San Lorenzo, CA | San Leandro, CA | United States |
| Population | 30,420 | 91,176 | 329,725,481 |
| Female Population | 49.4% | 50.8% | 50.5% |
| Male Population | 50.6% | 49.2% | 49.5% |
| Median Age | 39 | 40.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 23,562 | 85,108 | 309,327,143 |
| Population - 2000 | 21,898 | 79,452 | 285,036,114 |
| Population - 1990 | 19,987 | 68,223 | 251,960,433 |
| Pop. 2000 to Now | 16.6% | 12.2% | 15.6% |
| Pop. 1990 to Now | 27.7% | 30.7% | 30.8% |
| space4 | | | |
| Population Density | 10,962.2 | 6,834.3 | 93.4 |
| Land Area | 2.8 | 13.3 | 3,531,905.4 |
| Water Area | 0.0 | 2.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | San Lorenzo, CA | San Leandro, CA | United States |
| Age 0 to 4 | 5.5% | 4.1% | 5.9% |
| Age 5 to 9 | 5.3% | 5.1% | 6.1% |
| Age 10 to 14 | 6.3% | 5.0% | 6.6% |
| Age 15 to 17 | 3.4% | 3.5% | 3.9% |
| Age 18 to 20 | 3.1% | 3.3% | 4.0% |
| Age 21 to 24 | 4.5% | 4.8% | 5.2% |
| Age 25 to 34 | 14.9% | 14.7% | 13.8% |
| Age 35 to 44 | 12.9% | 14.3% | 12.9% |
| Age 45 to 54 | 14.4% | 13.2% | 12.6% |
| Age 55 to 59 | 7.9% | 8.0% | 6.7% |
| Age 60 to 64 | 6.9% | 7.5% | 6.3% |
| Age 65 to 74 | 9.3% | 9.4% | 9.6% |
| Age 75 to 84 | 3.9% | 4.8% | 4.5% |
| Age 85 and over | 1.7% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | San Lorenzo, CA | San Leandro, CA | United States |
| White | 21.0% | 21.5% | 59.4% |
| Black | 3.7% | 9.7% | 12.2% |
| Asian | 28.2% | 34.2% | 5.6% |
| Native American | 0.3% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 1.1% | 1.6% | 0.2% |
| Other | 0.4% | 0.5% | 0.4% |
| Two or More Races | 3.3% | 4.4% | 3.2% |
| Hispanic | 42.0% | 27.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | San Lorenzo, CA | San Leandro, CA | United States |
| Married Population | 51.0% | 47.0% | 49.8% |
| Currently Married | 49.0% | 45.3% | 48.0% |
| Married but Separated | 2.0% | 1.7% | 1.8% |
| Single Population | 49.0% | 53.0% | 50.2% |
| Never Married | 35.5% | 38.2% | 33.8% |
| Divorced | 8.3% | 9.9% | 10.8% |
| Widowed | 5.2% | 4.9% | 5.6% |
| space5 | | | |
| Household Size | 3.38 | 2.94 | 2.60 |
| Households | 8,939 | 30,809 | 124,010,992 |
| Family Households | 6,719 | 20,540 | 80,755,759 |
| Married couple, w/children | 38.9% | 30.6% | 30.5% |
| Married couple, no children | 37.0% | 40.5% | 42.9% |
| Non Family Households | 2,220 | 10,269 | 43,255,233 |
| Single householder, w/children | 11.5% | 13.3% | 15.8% |
| Single householder, no children | 12.5% | 15.6% | 10.8% |